Tool 02
Key Signature Reference
Select a key to see its sharps or flats on a staff, its relative key, and all seven diatonic chords with Roman numeral analysis.
Key signatures tell musicians which notes are sharp or flat throughout a piece — instead of marking each note individually. Treble clef is used for higher-pitched instruments (guitar, piano right hand, violin). Bass clef is for lower-pitched instruments (bass guitar, piano left hand, cello). The sharps/flats always appear in a specific order on the staff.
Select Key
Sharps / Flats
0
No accidentals
Relative Minor
A
Same key signature
Scale Notes
C D E F G A B
Staff Notation
Treble Clef
Bass Clef
Diatonic Chords — 7 Chords Built From This Key
Roman numerals show each chord's function in the key. Uppercase = major chord, lowercase = minor chord, ° = diminished. The I chord is "home base" — it sounds resolved. The V chord creates tension that wants to resolve back to I. The vi chord is the relative minor — same notes as the key but with a darker feel.